10 Best Diesel Engine Oil of August 2025

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Provides 1. 5% improved fuel economy performance compared to SAE 15W-40 oils
• Triple Protection Plus formula combines fully synthetic base oils with advanced additives for excellent equipment protection and long engine life
• Formulated with additive technology that protects against the effects of soot, dirt and other contaminants
• Engineered with shear stability to resist viscosity loss and maintain optimal engine oil pressure
• Suitable for diesel-powered vehicles from tractor/trailers to classic cars and heavy-duty diesel pickups that allow an SAE 5W-40
• Part Number: 550045347-3PK

Shell Rotella T

• One Solution Technology suitable for a wide range of heavy-duty engines including diesel, gas and natural gas applications
• “The Only One“ endorsed and recommended by Cummins
• Outstanding oxidation resistance supports long oil life in heavy duty engines
• Superior wear protection for hardworking heavy-duty trucks and equipment

Valvoline

• “The Only One“ endorsed and recommended by Cummins
• Superior synthetic base stocks provide faster, safe starts during freezing weather and enhanced thermal properties for hot weather operations
• Outstanding oxidation resistance supports long oil life in heavy duty engines
• Superior wear protection for hardworking heavy-duty trucks and equipment

Valvoline

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Triple Protection Plus technology protects against wear, deposits and oil breakdown plus provides better low temperature flow compared to SAE 15W-40 oils
• Helps control engine deposits for reliability at extended oil drain intervals
• Formulated to control engine wear, 37% better than the maximum wear requirements in API CK-4 engine wear tests
• Heavy duty engine oil formulated with synthetic base oil components
• Delivers improved oxidation performance for increased resistance to breakdown under high temperatures compared to the previous formulation

Shell Rotella T

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Provides 1. 5% improved fuel economy performance compared to SAE 15W-40 oils
• Triple Protection Plus formula combines fully synthetic base oils with advanced additives for excellent equipment protection and long engine life
• Formulated with additive technology that protects against the effects of soot, dirt and other contaminants
• Engineered with shear stability to resist viscosity loss and maintain optimal engine oil pressure

Shell Rotella T

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• A premium synthetic blend, long drain  mixed-fleet engine oil specifically formulated for on- highway applications, including 2017 greenhouse gas (GHG 17) compliant diesel engines
• Isosyn Advanced Technology: The Next Generation of Heavy Duty Engine Oil Chemistry - engineered to deliver longer oil life, better wear protection and longer engine life
• Isoclean: Certified clean - ensure your lubricants meet OEM cleanliness requirements to help you minimize downtime, reduce maintenance costs and extend equipment life
• Provides high performance piston deposit control and turbocharger protection due to its superb oxidation performance. Its high performing detergent and dispersant additives provide excellent diesel engine component protection.
• Exceptional soot dispersancy and wear control - Cylinders, pistons, rings, and valve train components are well protected against wear and corrosion, providing optimum service life and minimal maintenance, contributing to maximum equipment utilization and minimal downtime.

Delo

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Formulated for enhanced deposit protection to help keep engines cleaner over the oil drain interval
• The advanced low-ash formulation helps control blocking of particulates filters and poisoning of exhaust after treatment devices, helping maintain vehicle emission compliance
• Maximize engine life Exceptional protection in control of valve train wear, piston ring and liner wear
• Enhanced shear stability performance for viscosity control and optimal oil pressure in your engine
• Provides outstanding protection for virtually all heavy duty diesel engines, including the latest emission controlled engines using EGR and containing a Diesel Particulate Filter

Shell Rotella T

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Formulated for enhanced deposit protection to help keep engines cleaner over the oil drain interval
• Exclusive low ash formulation helps protect the exhaust catalysts and particulate filters found on the latest low emission vehicles
• Meets or exceeds API CJ-4 requirements, and is designed to provide extra performance Shell Rotella T4 performs well in both older and new engines
• Enhanced shear stability performance for viscosity control and optimal oil pressure in your engine
• Provides outstanding protection for virtually all heavy duty diesel engines, including the latest emission controlled engines using EGR and containing a Diesel Particulate Filter

Shell Rotella T

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Advanced low-ash formulation helps control the blocking or poisoning of exhaust after treatment devices, helping maintain vehicle emission compliance and engine fuel efficiency.
• Synthetic base oil components provides the capability to improve cold starting and low temperature performance reduce fuel consumption
• The Advanced formulation delivers good engine cleanliness and protection against piston deposits ensuring engine and component reliability at extended oil drain intervals.
• Rotella T5 meets the requirements of the major US engine manufacturers for low emission applications.

Shell Rotella T